<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Example_1.html</title>
</head>
<body>
    <!-- 
        题目1: 对字符串进行排列组合, 得到所有字符的全排列组合(假设所有字符不重复)
                函数名：permutation
                参数：需要排列组合的字符串
                返回值：字符串的所有排列组合数组
                例如：permutation("abc") 返回 ["abc", "acb", "bac", "bca", "cab", "cba"]
     -->
     第一题:<input type="text">
     <button>点击验证</button>
     <input type="text">
</body>
</html>
<script>
    let oInput = document.getElementsByTagName("input");
    let oBtn = document.getElementsByTagName("button");
    // console.log(oInput, oBtn)

    function permutation(str) {
        for(let i = 0; i < str.length; i++) {
            
        }

    }

    oBtn[0].onclick = function() {
        oInput[1].value = permutation(oInput[0].value);

    }
</script>